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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c4a4f964ffe9a48e0ce4570a9dfbc9966bda2dbd0a1fff8e9c407efc266be244' 
  AND token = 'jjuDS5sdU6iJomaH3+9Ctp7dM7l2PU0QH7T1n49JkR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}